- Days until any dateCountdown in days and weeks
- Date difference calculatorDays, weeks and months between two dates
- Add or subtract daysDate N days from any date
- Age calculatorExact age and next birthday
- Day of the week finderWhat day was any date
- Business days calculatorWeekdays between dates
- Time card calculatorHours worked with breaks
- Week numberISO week of any date
- Days left in the yearYear progress
- Half birthday calculator6 months after your birthday
- Sleep calculatorBedtimes by sleep cycles
- Dog age calculatorDog years to human years
- Cat age calculatorCat years to human years
- Overtime calculatorTime-and-a-half pay
- Unix timestamp converterEpoch time ↔ date
- Military time converter24-hour ↔ 12-hour
- Electricity cost calculatorCost to run any device
- Hourly to salary calculatorHourly ↔ annual pay
Dates & time
All tools
18 free calculators. No sign-up, nothing stored.
- Exact calendar math · cited sources (EIA, U.S. law)
- Updated
- Reviewed by Alex · How we calculate
